SMTP is the Simple Mail Transfer Protocol, the most recent standard of which is defined in RFC 5321. It's the Internet standard for sending and receiving email.

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Bizzare routing: EITHER accepts emails OR sends depending if NetworkManager is running

Due to an otherwise unrelated hardware failure (long story) I've been forced to return an older Fedora Core system into service as a mail server. It's primary service is as a file server and Samba ...
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789 views

How to drop messages containing a specific text from exim4?

I am trying to filter messages received by exim4 on Debian by using a system_filter but for some reason exim4 keeps delivering them even if I know that the filter is loaded but the conditions are ...
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6k views

SMTP server works, but telnet to port 25 does not

I am running a lightweight SMTP server for processing incoming emails. I am using https://github.com/kennethreitz/inbox.py. I opened port 25 in my firewall and am running the server at 0.0.0.0:25. ...
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389 views

What is a good third-party SMTP software for custom logging?

I am currently using IIS 6 SMTP to send out some of our mail and I unfortunately amn't finding the logging performed by it to be verbose enough - nor am I able to customise it to the level I would ...
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2answers
437 views

How can I configure sendmail (or another mail server) to accept outbound mail, but to not send it out?

Is it possible to configure sendmail to accept all outbound email but to not send it out? Either it can just log them to be read later, or better yet, if it can be configured to send ALL outbound mail ...
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7k views

Sendmail is not sending

I have a sendmail server on a Solaris 10 server that's stopped working. I can't seem to find anything about failed messages in /var/adm/sendmail. Here's what I'm seeing when I try to debug: ...
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How to solve authentication error in sendmail relay through gmail [closed]

I followed the steps in http://www.linuxha.com/other/sendmail/gmail.html to setup gmail in send mail. But when I try to send mail I got the authentication failure message. —– Transcript of session ...
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278 views

postfix remote received header

I have two servers SERVER -1 (S1) and SERVER -2 (S2)(Based on centos 5 + Postfix). S1 contains my software and S2 is a SMTP. S1 submits mails to S2 and S2 mails to REMOTE STMP. Received mail show ...
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12k views

exim configuration: 503 AUTH command used when not advertised

I'm running a piece of software on a Windows server that sends email notifications via a remote SMTP server. It has very few configuration options, and only supports basic SMTP authentication without ...
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Windows 2003 Server IIS SMTP Sending SPAM

we have a Windows 2003 Server using IIS6 for SMTP and Websites. A couple of weeks ago the server started to send out SPAM emails. I'm trying to figure out how to identify where the SPAM is coming ...
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692 views

Is it safe to ublock 587, SMTP submission port?

We have had problems before with SMTP port 25 (smtp) - some PC's were sending spam mail throught that port. So we blocked that and only allowed only outgoing smtp servers we needed. Howerver, i read ...
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528 views

Exim as relay server

Hi I have exim running on port 8900 and another mail server running on port 25. This mail server will be used to relay outgoing emails to exim. But somehow I am getting this error from exim 550, ...
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4answers
2k views

Exchange 2007 server send out spam

Our exchange server is sending out spam, as it has been listed on various spam blacklist and not to sure know how to stop it. I've started with verify SMTP with a site like ...
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638 views

IIS Virtual SMTP to use the secondary IP when sending email

My hoster have assigned to my server a secondary IP adresse. For example, my primary IP adress is 174.10.10.1 and my secondary IP adress is 174.10.10.2. My donmain name "example.com" is binded to the ...
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550 Requested action not taken: mailbox unavailable

I setup a small box with Server 2003 64bit to be used as a webserver and email server for a small school. Real simple stuff for a few users. A simple website and a handful of emails. rDNS and spf ...